[jdk21u-dev] RFR: 8340176: Replace usage of -noclassgc with -Xnoclassgc in test/jdk/java/lang/management/MemoryMXBean/LowMemoryTest2.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle.

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Commit messages:
 - Backport 3e03e6673acfea543d0dbbc64b7a4f52e3292c2b

Changes: https://git.openjdk.org/jdk21u-dev/pull/1701/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1701&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340176
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1701.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1701/head:pull/1701

PR: https://git.openjdk.org/jdk21u-dev/pull/1701